Top Definition
NYFU (Nye-Foo)
1. Now You Fucked Up!
2. Performing an act that is highly intolerable to everyone around that had no participation in the act performed.
Tool: "Oh no, I took one of your cold beers from the fridge and i spilled it everywhere!"
Cool person: "...NYFU!"
by iHate Tools June 17, 2009
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